Dr. Clifford Frondel, a Harvard mineralogist who was among the first people on earth to view rocks brought back from the moon, died on Tuesday in a nursing home in Winchester, Mass. He was 95.

The cause was complications from Alzheimer's disease, his wife said.

As a scientist recruited by NASA to study the moon rocks brought back by Apollo 11 astronauts, Dr. Frondel was present when a box containing 48 pounds of rocks from the Sea of Tranquillity was opened in Houston on July 25, 1969.

Still, the authorities supervising the study were not taking any chances. When Dr. Frondel was exposed to lunar dust later that year while he was researching samples from the Apollo 12 mission, he was quarantined for two weeks.

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Dr. Frondel, who was born in New York, married Judith Weiss in 1949. They had one daughter, Barbara Frondel, 52, who lives in Israel. Dr. Frondel is also survived by a sister, Martita van Ness.

Mrs. Frondel, also a mineralogist, said she had met her husband through work. Eventually, she helped in his laboratory at Harvard, where he was a professor from 1939 to 1977.

''He always believed that his teaching was as important as his research,'' Mrs. Frondel said.

Over the years, Dr. Frondel was credited with discovering 48 new types of minerals. He has had two minerals, Cliffordite and Frondelite, named in his honor.

During World War II he worked with the Army Signal Corps to make quartz oscillator plates in walkie-talkies more efficient. The later application of that research is evident in the use of quartz timing devices in watches.

Dr. Frondel did influential work applying research methods used in mineralogy to other fields. He worked with Dr. Edwin L. Prien to develop a method of detecting kidney stones through X-ray technology.